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GRAFENHAUSEN, Germany — Prosecutors in the Mike Peterson trial spent the day at a home in Germany trying to unravel the mystery behind the murder of a Peterson family friend.

They believe a critical part of their case is in Grafenhausen, a small town tucked just outside of Frankfurt.

Peterson is on trial for killing his wife, Kathleen. Prosecutors are trying to find out if Peterson was the last person to see Elizabeth Ratliff alive.

Ratliff, a friend of Peterson's, was found dead at the bottom of the stairs in her Grafenhausen home in 1985.
Durham prosecutors claim she was murdered and want to know if Peterson is to blame.

In April, the Durham District Attorney's Office had Ratliff's body exhumed from her Bay City, Texas grave.
A new autopsy concluded she died as a result of a homicidal attack -- a death similar to Kathleen Peterson's death.
Mike Peterson is charged in her murder.

While in Germany, the Mike Peterson prosecution team will meet with German investigators and search through old
police records that may exist.

Prosecutors also had the chance to talk with Karin Hamm, Ratliff's former neighbor.

Hamm still lives in the house across the street from where Ratliff lived.
She told several people that on the night Ratliff died, she saw Mike Peterson leaving the house and said he looked like he was in a hurry.